There are many parties and celebrations in Udaipur on New Year and few of the options are Ramada Udaipur, Justa Sajjangarh, Jagmandir Island etc. There are many other lake side restaurants / cafes that will host the NYE celebrations.
There are lot of parties filled with new year celebrations in Udaipur here are a few spots
Cafe nirvana at Sajjangarh
Notomoro in hiran magri
Oriental palace in Subas nagar
Rani village near Rajiv Gandhi park
Besides you could visit
Emporiums, art centers, shopping malls where lot of shopping happens with discounts. You could make some time for rejuvenating spa and massages.
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Why not camping as a celebration for New Year’s? Spend the night under the starry sky and let yourselves relax with the beyond. Feel the soft touch of nature as you weave into your conversations, get mesmerized with the live music and D.J. sessions, fill yourselves up with appetizing food and varieties of drinks. The gates for this wholesome campsite will open from 5:30 pm. Couple (with stay): Rs.6000/- (inclusive of event entry, tents stay, and food)
Couple (without a stay): Rs.4500/- (event entry + food)
Stag (with stay): Rs.3500/- (event entry + food + camp stay)